Rotary feed cutter with shear bar arranged on a chord



1949- M. H. TUFT 2,457,951

ROTARY FEED CUTTER WITH SHEAR BAR ARRANGED ON A CHORD Original Filed May 11, 1942 FIG. 2

uvwzmm l-l TUFT ATTORIEYS Patented Jan. 4, 1949 UNITED STATES. PATENT OFFICE ROTARY FEED CUTTER WITH. SHEABFBAR ARRANGED ONA CHORD.

Miles H. Tuft; Lancaster, Califl, assignor, by

mesne assignments, to Deere Manufacturing: 00., a corporation of Iowa Original application May 11,1942, Seria1'No.. 442,563; Divided and thisapplication August: 30, 1944; Serial No. 551,933'

14 Claims. 1

The present invention relates generally to feed cutters and the principal object of this invention relates to the provisionof afeed cutter of-appreciably increased capacity, without a proportional increase in size and weight of the machine, and which is simple in construction and durable in operation.

This application is a division of myapplication, Serial No. 442,563, filed May 11, 1942.

A more specific object relates to the provision of a novel and improved feed cutter of the type comprising a cutter head of the flywheel type, having a plurality of' cuttingknives.extending, generally radially outwardly from the axis of rotation, the cutting edges of the knives being ing, substantially on a. level with the axis. of' rotation of the cutter. The cutter rotates in.

such a direction that the knives travel downwardly against the shear member, cutting the crop which is fed through the feed opening and discharging the latter by. centrifugal force through a discharge opening extending tangentially from the opposite side of the housing; The

rotor is rotated at such a high speed' that the limitation in capacity is determined by the size of the feed opening, which is determined by the length of. the shearbar betweenthe-rotor shaft and the periphery of the housing, or in other: words, by the radius of: the circular" housing. Therefore, a. morespecific object ofmy invention relates to theprovision of a cutter'of' theclass' described having a shear member; whichis longers than theradius oft'thehousing and:ofith'e-fly- Wheeltype cutter: by locating theshear member and. feed; opening in vertically spaced: relation .to the: axis ofirotaa tion so that the cutter bar orshe'ar member; ex-s tends across the entire housing. asa chord. of. the latter.

It will be evident to-those skilledsin' theart, however, that with a conventional straight cutter bar and a plurality. oiwknives on the rotor which extend exactly radially from: the axis-of rotation, there will; be: no: shearing: effect of. the

knife. against. the cutter' bar CV81. a: substantial portion of the latter; due: to. therfactz thatthe1= A conventional feed cutterrof'this':

Crops are fed to:

This object is 'accornplishedx knife moves downwardly overa portion of the cutter bar and'then moves upwardlyrelative to the remainder of the cutter bar; without accomplishing any cutting action in the last part of the range. invention to provide aflywheel type cutter and shear member: which is :longer than aradius of the rotary cutter, in which assembly provision ismade for producinga cutting action between the rotor and theshear: member over substantiallythe .entlrelength of'thelatter;

In the accomplishmentof this object, the shear' member is provided with a plurality of laterally spaced ridges extending transversely of the shear member; and terminating in sub stantially vertical cutting edges disposed in a common pl'anewiththe main horizontal cutting edgeof 1 the shear member. The-rotor knives are not disposed exactlyradially; but are positioned with the outer ends in slightly trailing relation, with the resultthat the portion of l the shear member over which the-blade moves downwardly is" substantially increased. Furthermore, by virtue of the verticalcuttingedges spaced along the shearbar; a shearing action is obtained across the entire lengthof the shear member.

A further. object has to do with the provision of" a novel feedroll; which is disposed overthe shear member and is' vertically shiitable to accommodateivariable amounts of crop material fedover the shear member anda related object has to: do with providing notches or'grooves in the. feed'roll'adaptedtoreceive the ridges on the shear member, andlthus' permit'the feed'roll to approach the'shear member to a distance less than the height of .the ridges. This permits a close control. of the material. as it passes over the shear member to the cuttingedges 'andpro videsfor holding the material against the shear member during thecutting operation.

A. still further. object. of the invention. relates tofthe provision of. a flywheel type. cutter head that is easily andreadilyremovable from the machine. for facilitating, repair and. maintenance thereof.

These and other objects and advantages of my invention will :be apparent to those-skilled in theart after a consideration of the following description, in. which. reference is had to the drawings :appendedzhereto, iniwhich Figurepl: isxa sectionalelevational view-taken through a feed cutter embodyingthe principles of the presentxinvention.

Figure. 2s is a: rear: elevationalview of the feed Hence, it is a further object of my 5 and comprises a supporting frame including a main transverse axle beam 6 mounted on a pair of laterally spaced supporting wheels, one of which is indicated at I in Figure 1. The machine is transported through the fields by means of a draft member 8, which can be connected to a tractor or the like.

The cutting mechanism is contained within a generally circular housing Ill comprising a front wall H, a back wall I2 and a substantially cylindrical wall i3 interconnecting the front and back walls H, H and extending peripherally around, the housing. The front wall H is fixed as by welding to the rear of the transverse main beam 6, and additional support for the housing is provided by a pair of laterally spaced brackets l4, [5 which are likewise welded to the transverse beam 6.

A rotary flywheel type cutter head It is disposed within the housing Ill and comprises a hub casting I! having a radial flange It, to which a pair of axially spaced plates I9, are secured by bolts 2!. The plates I9, '20 are spaced apart by tubular spacers 22 through which the bolts 2! pass. Positioned between the plates i9, 20 and welded thereto along their contacting edges, are four blade holding angle irons 23 which are disposed in angularly spaced relation to each other extending outwardly from the hub member 11. The angle iron supports 23 are not ex-- actly radial with respect to the radius of rotation but are tangent to a circle having its center on the axis of rotation, each of the members 23 being disposed substantially perpendicular to the adjacent members 23. The edges of the two flanges of the angle iron members 23 are welded to the front plate 20 while the apex or corner of each member 23 is welded to the rear plate IS.

The cutter head it rotates in a clockwise direction as viewed in Figure 2 and the cutting elements are in the form of blades 24, which are secured by bolts to the inside surfaces of the leading flanges 25 of the angle irons 23. The outer edge of each blade 24 is beveled to provide a cutting edge '27, the cutting edges 21 of the blades being disposed in a common vertical plane substantially perpendicular to the axis of rotation. Each of the blades 24 is adjustable inwardly and outwardly on its supporting flange 25 to enable the blade edges to be aligned in the common plane and this adjustment is secured by means of a pair of set screws 28 which extend through threaded apertures in the trailing flange of each angle iron support 23 and bear against the back edge of the knife blade 24. A suitable lock nut locks the set screw inadjusted position. A paddle 29 is fixed at the outer end of each of the angle irons 23 in close proximity to the inner surface of the cylindrical wall l3. These paddles 29 engage the crop material cut by the blades 24 and propel the material around the inner surface of the cylindrical wall l3 and through a discharge duct 3| disposed substantially tangent to the housing Hi and in communication therewith. A rotary flywheel cutter of this general type is shown and claimed in Patent No. 2,313,872 granted to Hill, March 16, 1943, to which reference may be had for a more complete description of the blade adjusting means. The paddles 29 are braced by reenforcing gussets 32 to withstand the impact of the cut material while the cutter is rotating at high speed.

The rotor I6 is rotatably supported on a fore and aft extending dead spindle 35, which extends through the front wall I! of the housing ill and through aligned holes in a pair of transversely disposed channel beams 36, 31, which are supported by suitable means (not shown) on the main supporting beam 6. The spindle 35 is welded to the front channel beam 31 and the two channels 36, 3'! are interconnected by upper and lower plates 38, 39 which are welded to the top and bottom flanges, respectively, of. the channel beams to form a rigid box beam of great strength for supporting the spindle 35 and the cutter head I6. An annular spacer 40 is mounted on the spindle 35 and is welded to the back of the rear channel beam 36 and to the front housing wall H. The hub l! is journaled on a pair of axially spaced roller bearings 4|, 42, the outer races of which are pressed into recesses 43, 44, respectively, in, the hub casting I1, while the inner races are mounted on the spindle 35. The inner race of the front bearing 4! bears against the end of the annular spacer 40 and the bearings are secured on the spindle 35 by means of a nut 45 which is threaded onto the end of the spindle and bears against the inner race of the rear bearing 42. An oil seal 46 in front of the bearing 4i, and a cap 41, bolted to the end of the hub casting ll, protect the bearings against dust and retain lubricant within the bearing enclosure. The rear end of the hub IT projects through an opening in the back wall [2 of the cutter housing and is provided with a radial flange 48 to which a sprocket 49 is fixed by bolts 50.

The cutter head It is driven from a power shaft 53 by means of a drive chain 54 which is trained over the sprocket 49 and over a driving sprocket 55 which is fixed to the shaft 53. The shaft 53 extends forwardly at one side of the housing In and receives power from the tractor by means which is disclosed in the above-identifled co-pending application.

From the foregoing description, it will be evident that the cutter head Hi can be quickly and easily removed from the spindle 35 after the rear wall I2 of the housing has been removed, by removing the end cap 41 from the hub I1 and unscrewing the nut 45, after which the entire cutter head can be slipped rearwardly off the end of the spindle 35. The rear wall is detachably secured to the peripheral wall [3 by means of a plurality of circumferentially' spaced hook bolts 56.

The crop is delivered to the rotary cutter it over an upwardly and rearwardly inclined harvester platform 60, by suitable crop conveying mechanism shown and described in the aboveidentified co-pending application, but since such mechanism does not constitute an essential part of the present application, it is not included in this description. A relatively stationary shear member 6| is disposed transversely and is mounted on top of the main beam 6 in an opening 62 provided in the front Wall ll of the cutter housing for passage of the crop material into the latter. The top of the shear member 6| is flat and horizontal and has a plurality of substantially pyramid-shaped fore and aft extending ridges 63 disposed thereon, each of the ridges being inclined upwardly and rearwardly toward the rear edge of the shear member 6|. The shear memher. 6 I and the feed opening ,62 coextensive therewith; are disposed beneath theefore and aft ex tending axis of the rotary-cutter, sothat the shear member is disposed near the bottom of the circular; housing, Ill and: extends: transversely acrossthenlatter as'a chordot the circular housing 1.. By virtue of this position of thewshear member,.the blades 24 of the rotor move down.- wardly across the. rear. cutting. edge 65. of.the shearrmember 8|,atthe right hand side. of the latter; butas the. bladescontinuetheir circular path, they move acrosslthe-shear membercat. an increasingly. greaterangle thereto so. that asvthe blades; approachthe left. hand end' of theshear member-viii theyare moving substantially parallel tothe shear member;

Thecutting edges Z'I'of the blades l l are'not exactly radially disposed with respect to the axis of rotation of. the cutter'26; but as pointed out hereinbei'ore; the blade edges 27 are disposed'tangent. to a circlehaving the axisof rotationasits center, so that the outers'endsof the blades trail behind a true radial position. This has the effect: o'fprolonging the shearingaction between the. cutting edgesZ'i of: the blades 24 and the horizontal rear edge 65 of thevshearmember 6|, over a greater portion=of the edge 65, but nevertheless-thereis very little cutting'accomplished between these. two cutting edges at the extreme left hand end. of the shear member 61. However, each ofthesridges63 terminatesinthe vertical plane otthe'rear'edge. 65. of the shear member 61, providing. a: series oflaterally spaced vertical cutting edges fifivalong the right-hand rear edges oflthe ridges 63. Thus, the. ridges fi3 prevent-the crop; material fromsliding alongthe length of thershearmember, and the cutting action takes place in a series of working portions, each of which comprises the horizontal cutting edge 65 of theshea-r member El between twoadjacent ridges 63 andthe. vertical cutting edge 66 along the side of one of the ridges. Hence, at the righthand: end of the shear member; the. horizontal edge 65 does'most of the cutting because of the downwardsweep of the cutter knives 24; while at the left-hand end of the shear member. the verticaledges 66 do most of the cutting because of thehorizontal-sweep of the cutter knives,

Two additional ledger plates 61, 68 are fixed to the-frontwall I l of the housing along the lefthand edge of the opening 62; and these coopere ate with. the knifeblades to cut upianyrmaterial that is not cut by the edges 65,.66 0f the shear member. As shown in1Figure2; the plate fihis mounted withits cuttingedge substantially vertical, .while. the: plate 58. has. its cutting edge disposed substantially at 45 degrees in: an in-. wardly and upwardly inclined position.

The crop material is fed to the cutting edges by means of a feed roll 10; which is mounted on a transversely disposed drive shaft H extending outwardly through vertical slots 72: in the side walls" of the harvester platform 60.- Fixed' to the'feed roll Ill is a plurality of angle iron ribs 14 whichextend-axially of the feed roll HI and have radially extending flanges which arenotched at-Jitoreceive the. upper edges of the ridgesB-t, wherebyv the outer edges of: the ribs. 74 are enabled to. pass belowthe tops of the ridges in intermeshing relation. This not only=provides amore' positive feed for the crop'material, but also pre vents the; passage of comparatively large. stones into the cutter mechanism where they. might cause damage.

The: feed-roll- 10 is l free. to moveupwardlyand downwardly 'with respectto" the shear member to accommodate varyingamount-s of crop material fed to:v thecutten. .Thisvertical movement is provided for'byvirtue ofthe vertical slots 12 iillthei side walls, but a vertically adjustable stop bar 16 is attached to the outer side ofeach of the side walls'l3 and serves to engage the feeder roll shaft 1i tolimit the extent of upward movementrthereof. It. has been found that any stones which are small enough topass between the ridges 63; donotxcause serious: damage. to the cutting edges oftthe cutter. mechanism, but: the larger stones which bridge between two adjacent ridges fifiycausethe feed rolllflto rise into engagement with the: stop bars? 16, thereby preventing the stone from passing betweenthe: ribs 14 and the ridges 63:

During operation, power is suppliedthrough the shaft 53- andzthe chain 54 to drive the cutterrhead |6 ina= clockwise direction as viewed in Figural Thefeed roll 10 is driven by a suitable meanscinot shown) ina clockwise direction as viewed: in Figurefil, feeding the crop material over-and between the ribs 63 to the knives 24. The edges 21 of thelatter cooperate with the horizontal andvertical cuttingedges 65, 66 of the shear member it to shear the: crop material, and any of the-latter which is not cut by the above-mentioned cutting edges, is sheared. by the knives: 24" against the ledgerplates 61 and. 68. The sheared crop material is engaged by thepaddles 2% on the ends of the arms 23 and thrown by centrifugal force upwardly through the dis charge conduit 3| which conducts thechopped material'to-any suitable receptacle (not shown).

lclaim:

1-. In a rotary cutting machine of the class described,.the combination of a relatively stationaryshearmember'having a cutting edge along one side thereof, .said shear member having a plurality of laterally'spaeed ridges extending generally transversely of said cutting edge along the surface which receives the =.material to be cut; and a: feed roll=disposed adjacent said cutting edge'and generally parallel thereto and spaced away from said material receiving surface to provide for passage ofmaterial between said roll and said surface toward said cutting edge but spaced therefrom a distance-less than the height of said ridges, said roll being notched to receive the latter in intermeshing relation.

2; In a. rotary cutting machine of" the class described, the combination of a relatively stationary shear member having a cutting edge along one side thereof, said shear member having a plu rality of laterally spacedridgesextending generally: transversely of saidcutting edge along the surface which receives the material to be cut, and a feed roll disposedadjacent saidcutting edge and generally'parallel thereto and shiftable toward and. away'from said material receiving surface to provide for passage of variable amounts of materialtherebetween, said roll being notched to receive said ridges in inter-meshing relation when said: roll. approaches in close proximity to said surface. l

3; In a rotary cutting machine of the 'class described, the combination of-a relatively station'- ary' shear member having a main cutting edge along one'side thereof saidshear member having a plurality" of laterally spaced ridges extending generally-transversely of said cutting edge along the surface which receives the material'tobe cut, said ridges terminatlng in cutting edges disposed in a plane with said main cutting" edge anclin angular relation therewith, a rotary chopping member having cutting edges movable substantially in said cutting edge plane, and a feed roll disposed adjacent said cutting edges and spaced from said material receiving surface to provide .for passage of material between said roll and said surface .toward said cutting edge but spaced therefrom a distance less than the height of said ridges, said roll being notched to receive the latter in intermeshing relation.

4. In a rotary cutting machine of the class described, the combination of a relatively stationary shear member having a generally horizontal cutting edge along one side thereof, said shear member having a plurality of laterally spaced ridges disposed on top of said shear member and extending transversely of said cutting edge, said ridges terminating in generally vertical cutting edges rising from said horizontal cutting edge and in a common plane with the latter, a rotary chopping member having cutting edges movable substantially in said common plane, and a feed roll disposed adjacent said cutting edges and above said shear member, said feed roll being shiftably mounted to provide for vertical movement of said roll toward and away from said shear member to provide for passage of variable amounts of material there between, said roll being notched to receive said ridges in intermeshing relation when said roll approaches in close proximity to said surface.

5. A crop cutting machine of the class described comprising a rotary cutter head having atleast one knife blade fixedly mounted thereon so that the cutting edge thereof travels in a plane as the head rotates, a stationary shear member cooperatively associated with said knife blade, said shear member being spaced radially from the axis of rotation of the cutter head and disposed with its length perpendicular to a radius drawn through said axis, and a plurality of working portions on said shear member, each of said portions including a first cutting edge extending lengthwise with respect to the shear member and a second cutting edge disposed at an angle to said first cutting edge, whereby the material being cut is held by said second cutting edges against appreciable movement along the length of the shear member, and a feed roll rotatably disposed adjacent said cuttingedges but spaced therefrom sufficiently to pass therebetween the material to be cut, said feed roll having a surface generally complementary to thesurface of said shear member adapted to intermesh with said working portions of the latter to hold the material against said cutting edges in close proximity to said cutter head.

6. A crop cutting machine of the class described comprising a rotary cutter head, a plurality of knife blades fixed to the cutter head tangent to a circledescribed about the axis of rotation of the cutter head as a center, the cutting edges of said blades being disposed in a common plane, a stationary shear member cooperatively associated with said cutter head, said shear member describing a chord through the circular path traveled by the outer ends of the knife blades, and a plurality of working portions on said shear member, each of said working portions comprising a pair of cutting edges disposed in a plane parallel to and closely adjacent the plane of the cutting edges of said knife blades, one of said edges extending in a lengthwise direction with respect to the shear member and the other edge being perpendicular to said one edge and extending generally toward axis of rotation of the cutter head, and, a feed roll rotatably disposed in close proximity to said cutter head and cooperable with said shear member to pass crops therebetween to said cutting edges, said feed roll intermeshing with said working portions of said shear member and having an axially extending surface and a radially extending surface disposed substantially parallel to said pair of perpendicular cutting edges, respectively.

7. A crop cutting machine of the class described comprising a rotary cutter head, a plurality of knife blades fixed to said cutter head with their cutting edges disposed substantially in a common radial plane, a shear member positioned to one side of the axis of rotation of the cutter head, a cutting edge on said shear member disposed substantially in the plane of the knife blade edges, a plurality of ridges formed on the side of said shear member adjacent the axis of rotation of the cutter head, said ridges extending substantially perpendicular to the cutting edge of the shear memher and the ends of the ridges being disposed in the plane of the cutting edge, cutting edges formed on the ends of the ridges cooperative with said knife blades, and a feed roll journaled for rotation about an axis substantially parallel to the longitudinal axis of the shear member, said feed roll having radially extending ribs notched to receive said ridges, whereby the radially outer edges of the ribs are enabled to pass below the tops of the ridges.

8. A crop cutting machine of the class described comprising a rotary cutter head journaled for rotation about a horizontal axis, a plurality of knife blades fixed to said cutter head with their cutting edges disposed in a common plane perpendicular to said axis, a horizontally disposed shear member positioned below the axis of the cutter head, a horizontal cutting edge on said shear member disposed substantially in the plane of the knife blade edges, a plurality of substantially pyramidshaped ridges formed on the top surface of the shear member and extending generally perpendicular to the longitudinal axis of the shear member, the ends of said ridges having vertical cutting edges formed thereon cooperative with said knife blades, and a feed roll disposed above said ridges and journaled for rotation about an axis substantially parallel to the longitudinal axis of the shear member, said feed roll having radially outwardly extending crop-engaging ribs, and said ribs being notched so as to clear said ridges and permit the radially outer edges of the ribs to pass below the topsof the ridges.

9. In a rotary cutting machine of the class described, the combination of a generally circular vertically disposed housing adapted to receive a flywheel type cutter head rotatable about a central horizontal axis, a generally horizontal shear member mounted on one wall of said housing in Vertically spaced relation to the center of said housing and appreciably longer than a radius of the latter, there being a feed opening in said housing wall above and coextensive with said shear member, the latter having a cutting edge along the inner side thereof and a plurality of laterally spaced ridges on the upper surface extending transversely of said cutting edge terminating in vertical cutting edges rising from said horizontal edge and in a common plane with the latter, and a feed roll disposed adjacent said cutting edges and above said shear member, said feed roll being shiftably mounted to provide for vertical movement of said roll toward and away from said shear member to provide for passage of variable amounts of material therebetween, said roll being notched to receive said ridges in intermeshing relation when said roll approaches in close proximity to said surface.

10. In a rotary cutting machine, the combination of a generally circular vertically disposed housing adapted to receive a flywheel type cutter head rotatable about a central axis, said housing having a feed opening in one wall thereof extending across the housing on one side of said axis,

a first stationary shear member mounted along one side of said opening and describing a chord across said housing spaced from said axis and longer than a radius of the housing, and a second shear member disposed substantially in the plane of said first shear member and extending along another side or said opening at an angle to said first shear member.

11. In a rotary cutting machine, the combination of a generally circular vertically disposed housing having a feed opening in one wall thereof extending across the housing beneath the central axis of the latter, stationary shear members extending horizontally along the lower edge of said opening and upwardly along one side edge thereof, and a flywheel type cutter head rotatably disposed in said housing for rotation about said central axis and having at least one cutting blade cooperable with said shear members and movable during rotation of said cutter head in shearing relation with said horizontal shear member toward said upwardly extending shear member and into shearing relation with the latter.

12. In a rotary cutting machine, the combination of a generally circular vertically disposed housing having a feed opening in one wall thereof extending across the housing beneath the central axis of the latter, stationary shear members extending horizontally along the lower edge of said opening and upwardly along one side edge thereof, and a flywheel type cutter head J'ournaled in said housing for rotation about said central axis and having a plurality of knife blades disposed tangent to a circle described about the axis of rotation, the cutting edges of said blades being disposed in substantially the plane of said shear members, said blades being adapted to move downwardly in shearing relation with said horizontal shear member adjacent one end thereof, then moving toward a position perpendicular to said horizontal shear member and into shearing relation with said upwardly extending shear member in generally parallel relation thereto.

13. In a rotary cutting machine, the combination of a generally circular vertically disposed housing adapted to receive a flywheel type cutter head rotatable about a central axis, said housing having a feed opening in one wall thereof extending across the housing underneath said axis, a horizontal stationary shear member mounted along the lower edge of said opening and describing a horizontal chord across said housing below said axis and longer than a radius of the housing, a plurality of ridges formed on the top of said shear member extending transversely of the horizontal cutting edge of said shear member and the ends of said ridges being disposed in the plane of the cutting edge, cutting edges on the ends of said ridges and extending upwardly from said horizontal cutting edge, a second shear member at one end of said horizontal shear member and extending upwardly therefrom along the side of said opening, and a flywheel type cutter head rotatably disposed in said housing on said axis and having cutter blades adapted to move downwardly during operation in shearing relation with said horizontal cutting edge adjacent the other end thereof, then moving laterally toward a position perpendicular to said horizontal shear member, cooperating with said cutting edges on said ridges, and into shearing relation with said second shear member.

14. In a rotary cutting machine, the combina tion of a generally circular vertically disposed housing adapted to receive a flywheel type cutter head rotatable about a central axis, said housing having a feed opening in one wall thereof extend ing across the housing underneath said axis, a horizontal stationary shear member mounted along the lower edge of said opening and describing a horizontal chord across said housing below said axis and longer than a radius of the housing,

a plurality of ridges formed on the top of said shear member extending transversely of the horizontal cutting edge of said shear member and the ends of said ridges being disposed in the plane of the cutting edge, cutting edges on the ends of said ridges and extending upwardly from said horizontal cutting edge, a second shear member at one end of said horizontal shear member and extending upwardly therefrom along the side of said opening, a flywheel type cutter head rotatably disposed in said housing on said axis and having cutter blades adapted to move downwardly dur ing operation in shearing relation with saidhorizontal cutting edge adjacent the other end thereof, then moving laterally toward a position perpendicular to said horizontal shear member, cooperating with said cutting edges on said ridges, and into shearing relationwith said second shear member, and a feed roll disposed above said ridges and J'ournaled for rotation about an axis substantially parallel to the longitudinal axis of the shear member, said feed roll having radially outwardly extending crop-engaging ribs, and said ribs being notched so as to clear said ridges and permit the radially outer edges of the ribs to pass below the tops of the ridges.

MILES H. TUFT.

CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Hill Mar. 16, 1943 

